On the other hand you see guys who are for dealing consciously with attacks that are violent, brutal (as real attacks would be, normally - exception made for drunkards...), who are the same guys who would actually refrain from strangling other guys.

You mean the guys who pepper spray, taze, beat you with a baton or give you "lead poisoning" because (for various motives) they are not properly trained to safely, for everyone involved, choke their attackers into unconsciousness?

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That grabbing a neck is positively extremely dangerous, goes without contention.

No, it isn't and it doesn't.

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The fact so many persons seem to find it suitable, is because their murderous instincts are buried within themselves, they never came to term with those, and so this is how they manifest themselves: they think they're doing the right thing, and yet they do things that can be murderous.